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Processing method for acidized fracturing flow-back fluid

A technology of acid fracturing and treatment methods, which is applied in the fields of chemical instruments and methods, special compound water treatment, water/sewage treatment, etc., which can solve the problems of large consumption of chemicals, poor treatment effect, and increased treatment costs, and achieve improvement Oxidation efficiency, improvement of electrochemical oxidation efficiency, and effect of reducing power consumption

Inactive Publication Date: 2018-04-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In general, various waste liquid treatment technologies today have their own unique characteristics, but these technologies generally have some shortcomings in the actual operation. Neutralization, Fenton and other oxidation treatments and flocculation treatments require multiple pH adjustments value to achieve effective reaction conditions, resulting in cumbersome process; pH adjustment reagents, Fenton reagents and other oxidants, a large number of coagulation reagents, saturation and regeneration of adsorbents, resulting in large consumption of reagents and increased processing costs; for some high The treatment effect of waste liquid with high salinity, high chloride ion and high COD is not good, and a set of fixed and perfect treatment process has not been formed to deal with all or most types of waste liquid

Method used

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  • Processing method for acidized fracturing flow-back fluid
  • Processing method for acidized fracturing flow-back fluid
  • Processing method for acidized fracturing flow-back fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] according to figure 1 As shown, take the following steps:

[0045] (1) Pump the acidified fracturing flowback fluid into the aeration tank through the lift pump, and blow air into the tank, the aeration rate is 250L / min, and the aeration intensity is 3.5m 3 / m 2 h, the residence time is 30min.

[0046] (2) The effluent enters the electrocatalytic oxidation reactor through the pump, and the pH value of the sewage in the reactor is controlled to be 4.0-6.0 through the online monitoring and pH adjustment system during the reaction process. By controlling the automatic control system to adjust the constant current 1000A, the output voltage is 3.8V, so that the current density reaches 8mA / cm 2 , aeration is carried out at the same time, the aeration rate is 100L / min, and the aeration intensity is 1m 3 / m 2 h, residence time 25min.

[0047] (3) Monitor the pH value of the effluent from the electrocatalytic oxidation reactor, add an appropriate amount of pH regulator to ...

Embodiment 2

[0056] Process such as figure 1 As shown, the flocculation process was not adjusted by pH.

[0057] This method is used to treat the acidified fracturing flowback fluid of a fracturing operation in northern Shaanxi. The treated acidified fracturing flowback fluid has pH=5.8, conductivity=10.5ms / cm, COD=1350mg / L, hardness=2200mg / L, turbidity=380NTU. Specifically, it includes the following steps: First, pump the acidified fracturing flowback fluid into the aeration tank with a lift pump, the aeration rate is 200L / min, and the aeration intensity is 3m 3 / m 2 h, the residence time is 20min. Then use the lift pump to input it to the electrocatalytic oxidation reactor, set the pulse power supply constant current reaction, and the current density is 10mA / cm 2 , aeration intensity 1m 3 / m 2 h, residence time 35min. After the reaction, the pH of the effluent reaches 6.8, the concentration of PAC with a mass content of 28% is directly added at a concentration of 150 mg / L, and the...

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Abstract

The invention provides a processing method for an acidized fracturing flow-back fluid. The method comprises the following steps: (1) carrying out aeration on an acidized fracturing flow-back fluid tobe treated; (2) carrying out electrocatalytic oxidation reaction treatment on the acidized fracturing flow-back fluid subjected to the aeration treatment in the step (1); and (3) carrying out mixing flocculation on the acidized fracturing flow-back fluid subjected to the electrocatalytic oxidation reaction treatment in the step (2). According to the method disclosed by the invention, the pH valueis increased in the reaction process, so that the steps and the dosing amount of pH adjustment required for neutralizing the acidized fracturing flow-back fluid are reduced; oxidization of organic matters sewage can be promoted by the aeration, and weak acid radicals are decomposed into carbon dioxide, so that the pH value is increased.

Description

technical field [0001] The invention relates to the treatment of industrial wastewater, in particular, the invention relates to a treatment method for acidified fracturing flowback fluid. Background technique [0002] As an important strategic resource, shale gas exploration and development has been booming all over the world. However, the huge water consumption during mining will cause water resource problems, a large amount of fracturing fluid will flow back to the ground and the impact on the environment after reinjection. Acidized fracturing fluid is used in the initial stage of fracturing for each well to stimulate the reservoir. The acidified fracturing flowback fluid has the characteristics of high acidity, high stability, high COD and high salinity. It is strongly corrosive, and direct contact may cause burns. It will acidify the soil after it is discharged into the soil. It will produce toxic gas hydrogen sulfide when it interacts with sulfide scaling. After volati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/10
CPCC02F1/4672C02F1/5245C02F1/56C02F1/725C02F7/00C02F9/00C02F2103/10C02F2201/46135C02F2201/4614C02F2209/06C02F2209/08C02F2209/10C02F2209/44C02F2305/023
Inventor 罗臻张华张晓飞刘译阳
Owner BC P INC CHINA NAT PETROLEUM CORP
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